Keithley 2015, Service Manual

Page: 116 / 158

A-2 Specifications
DISTORTION CHARACTERISTICS
VOLTAGE RANGE: 100mV, 1V, 10V, 100V, 750V (user selectable).
INPUT IMPEDANCE: 1M
Ω
paralleled by <100pF.
DISPLAY RANGE: 0–100% or 0–100.00dB.
RESOLUTION: 0.0001% or 0.00001dB.
FUNDAMENTAL FREQUENCY RANGE: 20Hz–20kHz.
HARMONIC FREQUENCY RANGE: 40Hz–50kHz.
FREQUENCY RESOLUTION: 0.008Hz.
FREQUENCY ACCURACY: ±0.01% of reading.
FREQUENCY TEMPERATURE COEFFICIENT:
≤
100ppm over operating temperature range.
MEASUREMENT ACCURAC Y RESIDUAL
MODE (1 Year, 23°C ±5°C) DISTORTION 1
THD and individual ±0.8dB, 0.004% or –87dB
harmonic magnitudes 20Hz to 20kHz 2 20Hz to 20kHz
THD + n ±1.5 dB, 0.056% or –65dB
100Hz to 20kHz 2 20Hz to 20kHz
SINAD ±1.5dB +65dB
100Hz to 20kHz 2 20Hz to 20kHz
AC Level ±(0.13% of r
V rms 0.009% of range)
20Hz to 20kHz
Distortion Measurement Audio Filters
None C-Message
CCITT Weighting CCIR/ARM
CCIR “A” Weighting
NUMBER OF HARMONICS INCLUDED IN THD CALCULATION: 2 to 64 (user selectable).
HI AND LO CUTOFF FILTERS (bus settable): 20Hz–50kHz. Can be combined to form brickwall bandpass filter.
Distortion Measurement Reading Rate 3
FUNDAMENTAL MINIMUM
FREQUENCY FUNDAMENTAL READINGS
ACQUISITION FREQUENCY PER
MODE RANGE SECOND
Single acquisition 20 Hz to 100 Hz 14
or stored value 100 Hz to 1 kHz 24
1 kHz to 20 kHz 28
Automatic 20 Hz to 30 Hz 5.5
30 Hz to 400 Hz 6
400 Hz to 20 kHz 6.6